Abrading device



Nov. 17, 1942.

K. w. CONNOR 2,302,105

ABRADING DEVICE original Filed April 27, i936 NVENTOR BY M 2 A TORNE Ys.

Patented Nov. 17, 1942 ABRADING DEVICE Kin-ke W. Connor, Detroit, Mich.,assigner to Micromatic Hone Corporation, Detroit, Mich., l. corporationoi' Michigan Original application April 27, 1936, Serial No.

76,520, now Patent No. 2,200,573, dated May 14, 1940. Divided and thisapplication May 1,

1939, Serial No. 271,0

1 Claim.' (Cl. 51-67) This invention is a division of my application,Serial No. 76,520, filed April 27, 1936, which matured as Patent No.2,200,573, May 14, 1940, and relates to a honing method and device whichemploys a single abrading element which is rapidly oscillated andadvanced relative to a surface to be honed to produce an accurate andhighly polished surface.

In my Patent No. 2,108,029, dated February 8, 1938, and assigned to theassignee of the present invention, a method and apparatus are disclosedwherein a plurality of honing elements are rapidly reciprocated in timedrelation to the speed of rotation of the tool to produce a predeterminedangular intersection of the paths of abrasion during the time the tooland work are fed relative to each other. Certain features embodied inthe invention of the above mentioned application appear in the presentinvention.

In the present invention a single honing element is employed whicheliminates any binding and uneven wear on the stones which may occurwhen a plurality of the stones are employed in a single tool. It issubstantially impossible to grade the abrading stones relative tohardness so that when a group of stones are employed, the wearingqualities of some are materially greater than those of others and, as aresult, certain stones wear faster than others, causing a bindingbetween the stones when depending upon each other for support within thework piece and uneven wearing of the stones.

Due to the rapid oscillation of the honing stone, a method of grindingis provided which simulates that of hand polishing wherein the hand israpidly oscillated to move an abrading element over the surface to behoned. A feed movement is introduced between the oscillating stone andthe work to extend the abrading operation uniformly over the surface.

Accordingly, the main objects of my invention are; to provide a methodwhereby an abrading stone is rapidly oscillated during the time a feedmovement is provided between the Work and the stone; to provide rapidreciprocation of a single honing element having an engaging surfacecongruent to that of the work and advancing the work and honing stonerelative to each other to cover the entire surface to be finished; and,in general, to provide apparatus for accurately machining surfaces to ahigh mirror inish, which is simple in construction, positive inoperation and economical of manufacture.

Other objects and features of novelty of my invention will be eitherspecifically pointed out or will become apparent when referring, for abetter understanding of my invention, to the following description takenin conjunction with the following drawing, wherein:

Figure 1 is a view, partially in section, of a device operating on theexternal surface of a cylindrical work piece and embodying features ofmy invention;

Fig. 2 is an enlarged broken sectional view of structure illustrated inFig. 1, taken on the line 2 2 thereof; and. i

Fig. 3 is a wiring diagram which may be employed for controlling theoperation of the motors illustrated in Fig. 1,

In Fig. l I have illustrated a form which my invention may assume,embodying a honing stone 9| having a concave surface engaging acylindrical surface 92 of a work pie'ce 99. 'I'he work piece issupported on centers 94 and driven in rotation by a motor 96. The honingstone 9| is mounted in an oscillatable head 96 and is biased outwardlytherein by springs 91.

The head 96 is mounted for lateral oscillation on the end of a housing99, supported on the end of a link 99. The link 99 is pivoted at |0| andis provided on its lower end with a slot |02 through whichl a pin |03 inthe projecting lug' supported on a carriage |09 which operates in' ways|I| supported by a second carriage ||2 which is operated in ways H3 atright angles to the ways lll. The carriage |09 is actuated by suitablemeans herein illustrated as a lead screw Ill, while carriage ||2 isillustrated as being actuated by a lead screw ||5.

In operation, the motor drives the work piece 93 in rotation at apredetermined speed relative to the oscillation of the honing stone 9|controlled through actuation of rheostats 49 as illustrated in Fig. 3.The stone is moved into predetermined relation to the surface 92 of theWork piece 93 by the operation of the lead screw ||5 to move thecarriage ||2 downwardly toward the Work piece. During the abradingoperation, the honing stone 9| and work piece 93 are fed relative toeach other axially of the latter to have the abrading operation spreadover the entire length of the surface to be machined. In the structureillustrated, the operation of the lead screw III moves the carriage |09,and therefore, the abrading stone 9|, along the surface 92 parallel tothe axis of the work piece 93. In this manner, a very accurate andhighly polished surface is provided, which surface is known in 5 the artas a mirror nish.

While I have described and illustrated but a single embodiment of myinvention, it will be apparent to those skilled in the art that variouschanges, omissions, additions and substitutions 10 may be made thereinWithout departing from the spirit and scope of my invention as set forthin the accompanying claim'.

